dtrace to check wifi channel

wifi_channel.d

#!/usr/sbin/dtrace -qs

/*
 * Run with sudo ./tap_function.d -q
 */

struct ieee80211_channel {
	uint32_t	ic_flags;	/* see below */
	uint16_t	ic_freq;	/* primary centre frequency in MHz */
	uint8_t		ic_ieee;	/* IEEE channel number */
	int8_t		ic_maxregpower;	/* maximum regulatory tx power in dBm */
	int8_t		ic_maxpower;	/* maximum tx power in .5 dBm */
	int8_t		ic_minpower;	/* minimum tx power in .5 dBm */
	uint8_t		ic_state;	/* dynamic state */
	uint8_t		ic_extieee;	/* HT40 extension channel number */
	int8_t		ic_maxantgain;	/* maximum antenna gain in .5 dBm */
	uint8_t		ic_pad;
	uint16_t	ic_devdata;	/* opaque device/driver data */
	uint8_t		ic_vht_ch_freq1; /* VHT primary freq1 IEEE value */
	uint8_t		ic_vht_ch_freq2; /* VHT secondary 80MHz freq2 IEEE value */
	uint16_t	ic_freq2;	/* VHT secondary 80MHz freq2 MHz */
};

struct ieee80211_channel *c;

fbt:rtwn:r92c_set_chan:entry {

	c = (struct ieee80211_channel *)arg1;

	printf("Channel -> %d\n", c->ic_ieee);
}